[PATCH][MCAST]IPv6: Check packet size when process Multicast Addressand Source Specific Query

[Yan Zheng]

Signed-off-by: Yan Zheng <yanzheng@xxxxxxxx>

Index: net/ipv6/mcast.c
================================================================================
--- linux-2.6.14/net/ipv6/mcast.c	2005-10-30 23:09:33.000000000 +0800
+++ linux/net/ipv6/mcast.c	2005-10-31 13:13:10.000000000 +0800
@@ -1156,7 +1156,12 @@ int igmp6_event_query(struct sk_buff *sk
			return 0;
		}
		/* mark sources to include, if group & source-specific */
-		mark = mlh2->nsrcs != 0;
+		if (mlh2->nsrcs != 0) {
+			if (!pskb_may_pull(skb, mlh2->nsrcs * sizeof(struct in6_addr) +
+				(sizeof(struct mld2_query) - sizeof(struct icmp6hdr))))
+				return -EINVAL;
+			mark = 1;
+		}
	} else {
		in6_dev_put(idev);
		return -EINVAL;
-
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